Lifting jack



M... T. S'TBANAHAN.

LIETING JACK.

APPLICATION FILED APR.2 v1-920.

1,424,?48. t d Aug. 1, 1922.

M]? wsiramahan ATENT liTILES T. STRANAHAN, 01" ELYRIA, OHIO.

LIFTING JACK.

Application filed April 2,

To all whom it may concern Be it known that I, Mines T. STRANAHAN, acitizen of the United States, residing at Elyria, in the county ofLorain and State of Ohio, have invented certain new and usefulImprovements in Lifting Jacks, of which the following is aspecification.

This invention relates to lifting jacks and has for its principal objectto provide such a device of simple and durable construrtion, whichrequires but little effort to operate and is stable when in use.

Another object of the invention is to pro vide a lifting jack having adetachable op erating lever, which may be readily removed forconvenience in carrying the device in the tool box of an automobile,also that the operatinglever may be changed to the opposite side forlowering the jack.

With the above and other objects in view as will be readily understood,the invention will be hereinafter fully described as illustrated in theaccompanying drawings, and the novel features thereof will be distinctlypointed out in the appended claims. v

In the drawings, similar characters of reference are used to designatecorresponding parts.

Figure l is a side view of alifting jack constructed in accordance withmy invention, s

Fig. 2 is a sectional plan view taken on line 2-2 of Fig. 1,

Fig. 3 is a vertical sectional view, on an enlarged scale, of thelifting jack,

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3, the operatinglever being at the opposite side to that shown in Fig. 2, and

Fig. 5 is a side view of Fig. 4.

Referring to the drawings, 1 represents a hollow standard having a base2. Telescopically mounted within the standard 1 is a cylindrical shell3, which is adapted to be set at different elevations and also heldagainst rotation, by means of a pin 4 passing through aligning openings5 in said standard and opposite openings 6 through said shell. The upperpart of the shell 3 is increased in diameter to form a cylindrical neck7 which is increased at its end to form a top flange 8. A power wheel 9having teeth 10 is rotatably mounted upon the flange 8, and ballbearings 11 are interposed therebetween to reduce the friction formedintegrally upon the upper side of the power Specification of LettersPatent.

Patented Aug. 1, 1922. 1920. Serial No. 370,679. 1

ment of the screw when the power wheel 9 is rotated to cause verticalmovement thereof. The screw 14 is provided with a suitably shaped head17 for engaging the weights to be raised. I

The power wheel 9 is rotated by means of the mechanism now to bedescribed. Rotatably mounted upon the hub 12 and the neck 7, with thepower wheel 9 therebetween are-upper and lower sides 18 and 19respectively of a yoke 20, which is provided with a socket 21 forreceiving an operating lever 22. Extending laterally from and formedintegrally with the operating lever 22- is a lug 23, to which ispivotally connected at 24 a hook 25, having an inturned I end 26, witharear beveled side 27, which inturned end is adapted to engage the teeth10 of the power wheel 9. A suitable spring 28 is fixed to the lu 23 andbears against the hook 25 for holding it in engagement with the powerwheel. By pulling the operating lever forward. when the hook 25 is atthe rear side thereof, as shown in Fig. 2, the power wheel 9 is rotatedclockwise, thereby causing its internal threads 13 to act upon thethreads of the screw 14, and thus force it upwardly. In pushing theoperating lever in the opposite direction, the beveled rear side 27 ofthe end 26 of the hook, will slide over the teeth 10 of the power wheel,and the spring 28 will force the hook into engagement with said teeth.In order to lower the screw 14, the operating lever 22 is removed fromthe socket 21, turned over, and replaced in the socket, with the hook 25at the front side therof, as shown in Fig.4, engaging a tooth of thepower wheel. By pushing upon the operating lever 22, the power wheel 9will be rotated counter-clockwise, thereby lowering the screw 14. Thesides of the socket 21 of the yoke 20 are cut away at 29 to accommodatethe lug 23 of the operating lever 22, whether the lever is applied withthe hook 25 at either the rear or front side for raising or lowering thejack.

It is thought that the construction operation, and advantages of theinvention will be fully understood without further explanation.

Having fully described my invention, what I claim is:

1. In a lifting ack, the combination of a screw, means for supportingthe screw, means for permitting longitudinal movement of the screw andpreventing rotary movement thereof, a power wheel for causinglongitudinal movement of thescrew, a yoke, a lever, means pivoted to theside of the lever for actuating the power wheel, and the lever beingremovably connected to the yoke whereby, the means plJOiZOCl to the sideof the lever "for actuating the power wheel may be changed to eitherside of the power wheel, substantially as described.

2. In a lifting jack, the combination of a screw, means for supportingthe screw,

(means for permitting longitudinal movement ofthe screw and preventingrotary movement thereof, a power wheelffor cans ing longitudinalmovement of the screw, a yoke, a lever, a hook pivotedito one. side ofthe lever for actuating. the power wheel, and the lever being removablyconnected to. the yoke whereby the lever may be connected .to the yokewith the hook at either side of the power wheel, substantially asdescribed.

3. In a lifting jack, the combination oi? a screw, means for supportingthe screw, means for permitting longitudinal move ment of the screw andpreventing rotary, movement. thereof, a power wheel for cansinlongitudinal movement-of the screw, a yoIre, a lever, .the yoke beingprovided with a socket forithe attachment of the lever thereto, alugextending from the sideofthe lever, a hook pivoted to the lug foractuating the powenv vheel, and the lever being adapted to be insertedinto'the socket of the yoke to cause the hook to engage either side ofthe power wheel, substantially as described. V I

a. In a lifting ack, the combination'of ,a

screw, means .for supporting the screw,

means for permitting longitudinal movement of the screw and preventingrotary movement thereof, a power wheel for cansing longitudinalmovementof; the'serew, a

yoke, a'lever, the yoke being provided? with a socket forYtheattachment' 0tv the-lever thereto, a lug extending from thelside ofthe lever, a ho'okpivotedto the lug for actuating the. power wheel,a'spring fixed to the lug and tendingtoforcesaid hook intoengagementwith the power .wheel,,-and the lever'being adapted to: be inserted.intolthe socket of the yoketo causev thelhook to, engage either sideOfL-the poweriwheelnsubstans tially as described.

I tes imo y ere f-Ii affix, my signature.

,MILEs r, s'raANAHan;

